Outcomes of Flexor Tendon Repair in Patients With Concurrent Neurovascular Injuries of Multiple Digits in Zone 1

Purpose We treated several patients with multiple flexor (flexor digitorum profundus; FDP) injuries accompanied by injuries to the digital nerve or vessels around the distal interphalangeal crease (zone 1). Here, we retrospectively report the outcomes and review the literature. Materials and Methods Between January 2010 and December 2018, 16 patients who met the study inclusion criteria were investigated. Tendons were repaired using the cross-locked cruciate (Adelaide) technique (6-strand) or modified Becker method (4-strand). The neurovascular structures were repaired under a microscope. Results Sixteen patients (47 digits) were treated. According to the criteria of Moiemen and Elliot, the lacerated areas were in zones IA and IB in 7 and 40 digits, respectively. The mean ranges of motion were 149.27 +/- 7.78 and 66.43 +/- 2.04 degrees according to the Strickland and modified Strickland assessments, respectively. The mean 2-point discrimination was 5.00 +/- 0.63 mm. Four patients (group 1) presented with injuries to 2 digits, and 9 (group 2) and 3 (group 3) patients had 3 and 4 injured digits, respectively. The outcomes were satisfactory in terms of the mean range of motion; 2-point discrimination; cold tolerance; visual analog scale pain score; Disabilities of the Arm, Shoulder, and Hand score; and grip strength. There were no differences among the groups. Conclusions Open multiple-finger injuries involving flexor digitorum profundus rupture with concurrent neurovascular injuries on one or both sides occasionally occur in industrial environments. Fortunately, each digit exhibits a consistent injury type in a particular anatomical location; appropriate repair yields satisfactory outcomes despite the presence of multiple injuries.